[EC-CUBE] 4.21
[サーバ] mamp 6.8 on Mac OS 12.6.2
[PHP] 7.4.33

プラグイン開発のためとあるパッケージをインストールする必要があったため、composer self-update を実行

/usr/local/bin/composer --version
Composer version 2.5.5 2023-03-21 11:50:05

その後、まだ目的のパッケージは追加していない段階で composer update を実行したところ、

(略)
152 packages you are using are looking for funding.
Use the `composer fund` command to find out more!

Run composer recipes at any time to see the status of your Symfony recipes.

Executing script cache:clear --no-warmup [KO]
[KO]
Script cache:clear --no-warmup returned with error code 1
!!
!! In Kernel.php line 389:
!!
!! Trying to register two bundles with the same name "LeagueOAuth2ServerBundle
!! ".
!!
!!
!!
Script @auto-scripts was called via post-update-cmd

となってしまい、エラーで止まってしまいます。
上記エラーにつきまして、どのように対応したら良いのかご存じの方はお知らせいただけますでしょうか？

よろしくお願いいたします。

一度vendorディレクトリを削除してからcomposer updateを実行してみてください。
それで直らなければ使用しているパッケージに問題がありそうなので、composer.jsonのrequireおよびrequire-devの内容の共有をお願いします。

ご返信ありがとうございます。

composer.json につきましては、ec-cube4.21 のパッケージのもので、configで使用するphpのバージョンを7.4.33に変更しているのみとなっております。

"config": {
"platform": {
"php": "7.4.33"
},
"preferred-install": {
"*": "dist"
},

vendor ディレクトリを一旦削除して

> composer install

を実行したところ、下記のエラーとなりました。

You can not install the EC-CUBE plugin via `composer` command.
Please use the `bin/console eccube:composer:require ec-cube/api42` instead.

そこで、

> bin/console eccube:composer:require ec-cube/api42

を実行したのですが、bin/console が動作しなくなっております。bin/console list としても何も表示されません。bin/console が vendor ディレクトリ内のパッケージに依存していて、vendor ディレクトリが composer install がエラーで終了したため不完全であるためでしょうか。

以上のような状態です。
引き続き情報をお待ちしております。よろしくお願いいたします。

> You can not install the EC-CUBE plugin via `composer` command.
> Please use the `bin/console eccube:composer:require ec-cube/api42` instead.

EC-CUBEのWEB APIプラグインを使用されているようですので、composer.json及びcomposer.lockからec-cube/api42の記述を一度削除してください。
また、他にもプラグインを利用しているようであればec-cube/plugin-installer以外の`ec-cube`から始まる記載を同様に削除して、composer installを実行してみてください。

composer.json 及び composer.lock より ec-cube のプラグインの項目を削除して composer install を実行したところ、次のエラーとなりました。

Executing script cache:clear --no-warmup [KO]
[KO]
Script cache:clear --no-warmup returned with error code 255
!!
Script @auto-scripts was called via post-install-cmd

composer install は成功しているものの、その後のスクリプト実行にてエラーになっている模様です。またこの状態になったあとは./bin/console が無反応になります。./bin/console list をしても何も表示されません(前回と同じ)

引き続き情報をお待ちしております。

composer install実行時の出力は他にないでしょうか？

以下ec-cube関連のものをcomposer.jsonから取り除いてcomposer installした時の全ログです。

====

Installing dependencies from lock file (including require-dev)
Verifying lock file contents can be installed on current platform.
Warning: The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. It is recommended that you run `composer update` or `composer update <package name>`.
Package operations: 204 installs, 0 updates, 0 removals
- Installing symfony/flex (v1.19.4): Extracting archive
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Package easycorp/easy-log-handler is abandoned, you should avoid using it. No replacement was suggested.
Package sensio/framework-extra-bundle is abandoned, you should avoid using it. Use Symfony instead.
Package symfony/inflector is abandoned, you should avoid using it. Use EnglishInflector from the String component instead.
Generating optimized autoload files
152 packages you are using are looking for funding.
Use the `composer fund` command to find out more!

Run composer recipes at any time to see the status of your Symfony recipes.

Executing script cache:clear --no-warmup [KO]
[KO]
Script cache:clear --no-warmup returned with error code 255
!!
Script @auto-scripts was called via post-install-cmd

私の方でも同じパッケージをインストールしてみましたが、再現出来なかったため、状況確認という形で一旦対応させてください。
明確な解決法が提示できず申し訳ありません。

まず、composer dump-autoloadを実行後にbin/console -v aboutを実行して何か出力されるか確認していただけますか。
bin/consoleがエラー終了していれば何かしら表示されると思います。

./bin/console -v about で出力された結果は下記のようになります。

-------------------- ----------------------------------------
Symfony
-------------------- ----------------------------------------
Version 5.4.20
Long-Term Support Yes
End of maintenance 11/2024 (in +584 days)
End of life 11/2025 (in +949 days)
-------------------- ----------------------------------------
Kernel
-------------------- ----------------------------------------
Type Eccube\Kernel
Environment prod
Debug false
Charset UTF-8
Cache directory ./var/cache/prod (6.3 MiB)
Build directory ./var/cache/prod (6.3 MiB)
Log directory ./var/log (10.7 MiB)
-------------------- ----------------------------------------
PHP
-------------------- ----------------------------------------
Version 7.4.33
Architecture 64 bits
Intl locale en_US_POSIX
Timezone Asia/Tokyo (2023-04-26T11:52:37+09:00)
OPcache false
APCu false
Xdebug false

bin/consoleは正常に実行されているようなので、bin/console -v listでコマンドの一覧が表示されるか試してください。